Microlens Fingerprint Identification Optics With Angled Light-Guiding Channels
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Solution Overview
Problem
Existing fingerprint identification technologies face challenges in achieving miniaturization, ultra-thinness, and high identification performance for use in mobile terminals, requiring improved fingerprint imaging quality and accuracy.
Innovation Solution
An apparatus for fingerprint identification is designed with multiple light guiding channels and pixel units at different angles, constrained by specific positional relationships and aperture ratios, allowing for both large and small light collection angles to enhance imaging and identification performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the apparatus is miniaturized and made ultra-thin for mobile terminal installation, then the device size is reduced and adaptability to handheld terminals is improved, but the fingerprint identification performance and imaging quality deteriorate
Solution Approach 1:
The light blocking layer is divided into multiple segments with different aperture positions, creating multiple light guiding channels (first light guiding channel, second light guiding channel, etc.) with different light collection angles. This segmentation allows the apparatus to capture fingerprint light signals from multiple angles simultaneously, improving imaging quality without increasing overall device size
Solution Approach 2:
Different regions of the light blocking layer are designed with different aperture positions to create local variations in light collection characteristics. The first light blocking layer has apertures at specific positions while the second light blocking layer has apertures at different positions, creating localized optical paths that collectively improve fingerprint imaging quality in the miniaturized structure
2Measurement precision
If multiple light guiding channels with different angles are introduced to improve imaging quality, then fingerprint identification accuracy is improved, but the device complexity increases
Solution Approach 1:
Multiple light guiding channels with different light collection angles are merged into a single integrated light blocking layer structure. The first and second light blocking layers are combined in a stacked configuration, where each layer contributes different angular light paths, achieving multiple functions (different light collection angles) within a unified structure to minimize overall complexity
Solution Approach 2:
The light blocking layer is designed to perform multiple functions simultaneously: it blocks unwanted light while creating multiple light guiding channels with different angles, and it structures the optical paths for both wide-angle and narrow-angle light collection. This multi-functionality reduces the need for separate components, managing device complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution improves fingerprint imaging quality and identification accuracy by effectively guiding and receiving fingerprint light signals in diverse scenarios, enhancing the apparatus's performance and adaptability.
Implementation Method 1
a microlens; at least two light blocking layers arranged below the microlens, where each light blocking layer among the at least two light blocking layers is provided with a light-passing aperture, and the light-passing aperture is configured to allow a fingerprint light signal that is reflected or scattered by a finger above the display screen, is then returned, and is converged via the microlens to pass through
Data Source
AI summary
Embodiments of the present disclosure provide an apparatus for identifying a fingerprint and an electronic device. The apparatus includes a plurality of fingerprint identification units distributed in an array, and each of the fingerprint identification units includes: a microlens, at least two light blocking layers, and a plurality of pixel units. Light-passing apertures in the at least two light blocking layers form a plurality of light guiding channels corresponding to the plurality of pixel units. The plurality of light guiding channels include a first light guiding channel and a second light guiding channel, an angle between a direction of the first light guiding channel and a first direction is a first angle, and an angle between a direction of the second light guiding channel and the first direction is a second angle, where the first angle is different from the second angle. The apparatus can have high fingerprint identification performance.